Alloy



Patente Fe. Z6, 13

a m as a...

armon Edward F. Fischer, Cleveland, (Dhio, assignor, by

mesne assignments, to Magnesium Development Corporation, a corporationof Delaware No Drawing. Application February 6, 1934,

Serial No. 709,970

4 Claims. (ill. 35-1) of the metal, the tensile strength in the as castcon-' dition being about 13,000 pounds per square inch while the rolledmetal only has a tensile strength of about 25,000 pounds per squareinch. Such 1 limitations in strength have restricted the wider use ofthe metal.

It is an object of my invention to utilize the inherently advantageousproperties of the pure metal and at the same time to overcome some 20 ofthe handicaps. A particular object is to improve the strength of themetal without substantially diminishing its ductility.

I have found that from about 0.5 to per cent of antimony can be added tomagnesium thereby 25 causing a surprisingly large increase in strength;

The weight of the alloy does not differ substantially from that of theunalloyed metal.

For many purposes an extruded product is desirable either by reason oflow production cost 30 or because the intricate shape of the articlerenders difficult other methods of working. I have found that themagnesium-antimony alloys herein described may be readily extruded underthe same conditions employed in handling the 35 pure metal while at thesame time a material is obtained which has appreciably higher strengthvalues than the pure magnesium. A magnesium-antimony alloy, for example,containing about 1 per cent of antimony had a tensile strength of about33,600 pounds per square inch and an elongation of about 3.5 per cent intwo inches in the as-extruded condition. An increase in the antimonycontent of 4 per cent served further increase the strength, a value ofabo 36,400 pounds per square inch being obtained. The elongation inthiscase was 5 per cent, somewhat more than in the alloy of lower antimonycontent. For most purposes I prefer to use between about 1 and 4 percentof antimony.

The alloy may be prepared in any manner knownto those skilled in the artbut preferably I use a rich alloy? for the purpose of adding theantimony because of the vigorous action between molten magnesium andmetallic antimony. The use of a rich alloy obviates this dificulty to agreat extent.

The term magnesium as used herein and in the appended claims refers tothe commercially available metal.

I claim:

. 1. A magnesium base alloy composed of magnesium and from about 0.5 to5 per cent of antimony.

2. A magnesium base alloy composed of magnesium and from about 1 to 4per cent of antimony.

3. A magnesium base alloy consisting of magnesium and about 1 per centantimony.

4. A magnesium base alloy consisting of magnesium and about 4 per centantimony.

- EDWARD F. FISCHER.

